chandler0227 wrote:
2. BMW 第五代eDrive是用三相交流同步馬達(three-phase AC synchronous motors)
提到無使用稀土金屬
交流馬達本來就是無刷設計，沒有碳刷更換問題
ref: https://bimmerlife.com/2022/04/23/bmws-fifth-generation-edrive-electric-motors-explained/
你是不是沒認真看你轉的文啊？
BMW的馬達有刷啊！只是”刷”被封在一個盒子內，灰塵跟髒污能控制在盒內不會到處跑。我就是看了這篇文加上一直漲價才放棄i4跟iX，雖然我知道電池應該會早在電刷需要更換之前就老化了。
BMW is making use of cutting-edge sealant technology to extend the lifespan of its brushed motors by encapsulating them in an enclosure which eliminates dust contamination inside the stator and wiring from the brushes making contact with the commutator.
This raises the question of how long a BMW EV like the i4 or iX will last before it needs a potentially major brush replacement service or a new electric motor and/or battery pack.
